410 Proceedings of the Society of Arts. 



which the Committee reported in equally favourable terms. 

 This Communication, also, was not a competing one. 



3. To William Galbraith, M.A., C.S.A., Teacher of Mathe- 

 matics, Edinburgh, for his Communication on a Formula to ob- 

 tain the Decrease of Temperature according to the Height above 

 the Earth's Surface ;— read 11th April 1838. (546.) 



4. To Mr Edward Sang, F.R.S.E., Civil Engineer, Edinburgh, 

 for his Essay on the Construction of Oblique Arches ; witjj 

 Model and Drawings; — read and exhibited l6th May 1838, and 

 previous dates. (511.) Ordered to be printed in an abi'idged 

 form in the Transactions. 



5. To Mr George Richardson, Printer, 35 Miller Street, Glas- 

 gow, for a Communication sent by him in competition for the 

 Prize offered " For a Method of Removing the Plaster of Paris 

 from the Types after Stereotyping, without injuring the Types ;" 

 —read 28th February 1838. (516.) 



The Thanks of the Society are given to Mr Richardson be- 

 cause he has to a certain extent succeeded ; — in so far as he 

 has found out a simple method of removing the Stucco ; — 

 but the condition of the Prize is, that this must be done 

 " without injuring the Types ;" now, it is found that the 

 Types, after having undergone his process, become, when 

 dry, so firmly cemented together, that they cannot be sepa- 

 rated except by force, which is not only attended with in- 

 jury to the Types, but with greater delay than the common 

 mode. A method of preventing the latter defect would 

 render his invention eminently useful. 

 All which is humbly reported by 



DAVID MACLAGAN, Convener. 



Museum of the Society of Arts, 

 63 Hanover Street, Edin. 

 ]0«/(D«raH6«-1838. 



In presenting the " Keith Medal " to Mr Sang, Sir John made a few 

 remarks to the following import. — " The late Alexander Keith, Esq. of 

 Ravelston and Dunottar, the representative of an ancient and honourable 

 family, often celebrated in Scottish history, had laudably promoted the 

 cause of science while he lived, and had devised the means of its ad- 

 vancement after his decease, now at disposal of the Society, as the 

 ' Keith Medal,' to be given for the most important invention, discovery, 

 or improvement in the useful arts. But no opportunity had hitherto oc- 

 curred since the Keith Fund came into the possession of the Society of 

 awarding that prize. Now, however, it was highly gratifying to find 

 one of the most scientific, useful, and meritorious of all who had been 

 connected with the Society, Mr Edward Sang, entitled to this eminent 

 distinction. His skill, his labours, and unermitting exertions in various 

 scientific departments, were too well knovra to be embellished by any 

 commentary. It was alike creditable to him to receive such a testimony, 

 and for the Society to have such an opportunity of bestowing it." 



I 



